Question

Does the equation have a minimum or maximum value and what is it?
Equation= y = 4x^2-6x-4 It's vertex: (3,-40)

Answer 1

this equation has a minimum....because y'' is positive

1)take the derivative ....equate it to zero
2)solve for X
3)substitute the value of X in the original equation to get that value....

Answer 2

Well, the equation has a min because the sign of the leading coefficient is positive. To find it, use x = -b/2a. Then use plug that x-value back into the equation to get y. So your minimum will be at (x,y). Ok?

Answer 3

theprophet: whats the derivative?
coolmath : how do i get the x alone ? i forgot how to do that.

Answer 4

Y = ax^2 + bx + c is the form your equation is in. b = -6, a = 4.

Answer 5

So, x = -(-6)/8. Or x = 3/4

Answer 6

Plug that back into your equation to get your y-value.

Answer 7

fine fine!!!
u can try perfect square method where u make the equation into a perfect square plus sum constant....